Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. Closure, identity, associative, and commutative only
B. Closure, identity, inverse, and commutative only
C. Closure, identity, inverse, and associative only
D. All of them
Answer: D
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Solve the problem. Round amounts to the nearest cent and percents to the nearest tenth of a percent.The Oak House had a markup of $22.83 on an oak table that they sold for $89.99. Find the cost and the percent of markup.
A. $89.99, 25.4% B. $67.16, 25.4% C. $67.16, 34.0% D. $112.82, 20.2%
Factor by grouping.2y3 + 8y2 - 12y2 - 48y
A. 2y(y + 4)(y - 6) B. (y + 4)(y - 6) C. 2y(y - 4)(y + 6) D. (y + 4)(2y2 - 12y)
Find the exact value under the given conditions.sin ? = - 
, 
< ? < 2?; tan ? = - 
, 
< ? < ?Find cos (? + ?).
A. - 
B. - 
C. - 
D. 
Perform the indicated operation. Write the answer in standard form.2i(4 - 6i)
A. 8i + 12i2 B. 12 + 8i C. 8i - 12 D. 8i - 12i2